Dear users,
We have changed the IP of smtpdm-ap-southeast-1.aliyun.com in Singapore region of Direct Mail from 47.88.198.4 to 47.246.110.138. At present, we find that your service is still using the old IP:47.88.198.4 to send emails. We will completely take offline the old IP:47.88.198.4 after 2024-4-8 10am. At that time, you will no longer be able to use the old IP to send emails, so please connect the Direct Mail program to the new IP:47.246.110.138 as soon as possible.
You may have this problem because your program caches an old IP address or your service host is configured with mandatory domain name resolution. If you do not know how to solve this problem, please follow the recommended steps below to try and solve it:
1. Ensure that the latest domain name IP: 47.246.110.138 can be obtained by using the dig smtpdm-ap-southeast-1.aliyun.com command. If the old IP is returned by using this command, please use the cat /etc/ hosts command to determine whether smtpdm-ap-southeast-1.aliyun.com resolution is forcibly bound. If so, please delete the binding. If host force binding is not configured, please contact your network administrator to check whether DNS force resolution is set.
2. Under the condition that the latest IP: 47.246.110.138 can be obtained by using the dig smtpdm-ap-southeast-1.aliyun.com command, you may restart the service process to prevent your program from caching the old IP.
3. If the sending service fails to connect to the latest IP: 47.246.110.138 after restarting the service, please contact your network administrator to determine whether IP: 47.246.110.138 and port 25/465/80 need to be whitelisted.
4. If the emails still cannot be sent normally after the above operations are completed, please email to dm-support@alibaba-inc.com to contact the Direct Mail team for consultation.